<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave"> 批量保存</el-button>
  
    <el-tree
      :data="menus"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKey"
      :default-checked-keys="[]"
      :props="defaultProps"
      :expand-on-click-node="false"
      @node-drop="handleDrop"
      :draggable="draggable"
      :allow-drop="allowDrop"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level<=2" type="text" size="mini" @click="() => append(data)">添加</el-button>
          <el-button type="text" size="mini" @click="() => edit(data)">修改</el-button>
          <el-button
            v-if="node.childNodes==0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >刪除</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      v-bind:title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      category: {
        name: "",
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        catId: null,
        name: null,
        productUnit: "",
        icon: "",
      },
      dialogType: "",
      dialogVisible: false,
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  methods: {
    batchSave(){
         this.$http({
        url: this.$http.adornUrl("/product/category//update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜单顺序修改成功!",
          type: "success",
        });
        //刷新菜单
        this.getMenus();
        this.expandedKey = [this.pCid];
        this.maxLevel = 0;
        this.updateNodes = [];
       // this.pCid = 0;
      });
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log("tree drop: ", dropNode.label, dropType);
      //1.当前节点最新父节点的id
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }
      this.pCid.push(pCid) ;
      //2.当前节点最新的顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点层级发生了变化
            catLevel = siblings[i].level;
            //继续修改子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
      //3.当前拖拽节点的最新层级
      console.log("updateNodes", this.updateNodes);
   
    },
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    countNodeLevel(node) {
       //找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    //判断节点是否可以拖拽的方法
    allowDrop(draggingNode, dropNode, type) {
      //被拖动的当前节点以及所在的父节点总层数不能大于3

      console.log("draggingNode, dropNode, type", draggingNode, dropNode, type);
      this.countNodeLevel(draggingNode);
      //当前拖拽的节点加上父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;

      console.log("深度", deep);

      if (type == "inner") {
        return deep + dropNode.level <= 3 ;
      } else {
        return deep + dropNode.parent.level <= 3 ;
      }
    },
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    //修改三级分类数据
    editCategory() {
      var { catId, name, icon, productUnit } = this.category;
      this.dialogVisible = false;
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData({ catId, name, icon, productUnit }, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜单修改成功!",
          type: "success",
        });
        //关闭对话框
        this.dialogVisible = false;
        //刷新菜单数据,继续展开当前节点
        this.getMenus();
        //展开同样的父菜单
        this.expandedKey = [this.category.parentCid];
      });
    },

    //添加三级分类数据
    addCategory() {
      console.log("提交的三级分类数据", this.category);
      this.dialogVisible = false;
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          message: "添加成功!",
          type: "success",
        });
        //关闭对话框
        this.dialogVisible = false;
        //刷新菜单数据,继续展开当前节点
        this.getMenus();
        //展开同样的父菜单
        this.expandedKey = [this.category.parentCid];
      });
    },

    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取菜单数据........", data.data),
          (this.menus = data.data);
      });
    },

    append(data) {
      this.title = "添加";
      console.log("appden", data);
      this.dialogType = "add";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel + 1;
      this.category.name = "";
      this.category.catId = null;
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.sort = 0;
      this.category.showStatus = 1;
    },

    edit(data) {
      this.title = "修改";
      this.dialogType = "edit";

      //发送请求获取最新的节点数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
      }).then(({ data }) => {
        console.log("要回显的数据", data.data);
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.productUnit = data.data.productUnit;
        this.category.parentCid = data.data.parentCid;
        this.dialogVisible = true;
      });
    },

    remove(node, data) {
      var ids = [data.catId];

      this.$confirm(`确定对<${data.name}>菜单进行删除操作?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          });
        })
        .then(() => {
          this.$message({
            message: "删除成功!",
            type: "success",
          });
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = [node.parent.data.catId];
        });
    },
  },

  created() {
    this.getMenus();
  },
};
</script>
 
<style scoped >
</style>